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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Depreciable Assets | The ranges of estimated useful lives and the weighted average useful lives are summarized below:
| Range of useful lives |  | Weighted average useful lives
| 2021 |  | 2020 |  | 2021 |  | 2020
Generation | 3-60 |  | 3-60 |  | 33 |  | 33
Distribution | 1-100 |  | 1-100 |  | 40 |  | 40
Equipment | 5-50 |  | 5-50 |  | 11 |  | 11

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